How can I mount a data file (pst) in new outlook. In the classic version this is doable through the File menu which is not available in new outlook.

OK, fine, 'use the old version of our product' as a fix....

Now, give me my **** money back for the 'NEW' piece of **** that doesn't work!!!!

In Microsoft 365, it is not working either. I'm not going to the new version if the PST files are not working.

I have a lifetime of emails in my PST files.

Importing is no option, because it is way to big.

Hi anon151,

Good day.

Thank you for posting to the Microsoft Community. We are glad to assist.

I understand your concern regarding mounting a PST file in the new version of Outlook. Unfortunately, the new Outlook for Windows does not currently support direct access to PST files. However, I’ll provide you with alternative steps to achieve your goal:

Import from an External PST File:

• Click on File in the Outlook menu bar.
• Select Open & Export > Import/Export.
• Choose Import from another program or file and click Next.
• Select Outlook Data File (.pst) and click Next.
• Browse to the location of your PST file and select it.
• If the PST file has a password, enter it and click OK.

Use OST Files:

• The new version of Outlook uses a different file format called OST (Outlook Offline Data File) instead of PST.
• OST files serve a similar purpose as PST files and store email messages, contacts, and other data.
• When you connect your Outlook account to an Exchange server, it automatically creates an OST file for offline access.
• You can’t directly create an OST file, but it’s automatically generated when you set up an Exchange account in Outlook.

Provide Feedback:

• Since the new Outlook is still under development, many features are not fully functional.
• If you have suggestions or need specific features, you can provide feedback by selecting Help and choosing Support orFeedback.

In summary, while direct PST file access is not available in the new Outlook, you can import data from an external PST file or work with OST files.

I hope this helps let me know if this is contrary to what you need, I would still be helpful to answer more of your questions .

Best Regards

Community Moderator

This is not an option.

My PST files are huge. There are mails in there that are very old.

It is easy to back-up as a PST file and not too big for the mail servers.

Importing as OST is not possible.

Just bring back the PST files. That's what your customers want.

Outlook Classic will be supported until at least 2029, there is no urgent need to switch to Outlook New at this time. You can now open a .PST in Outlook New, but functionality is still fairly limited:

This only works on Intel processors...believe it or not..."Outlook Data Files" is not supported on my Microsoft Surface Arms processor machine! It gets a different build! :(